Submission #979391

#	Time	Username	Problem	Language	Result	Execution time	Memory
979391		Mher777	Swapping Cities (APIO20_swap)	C++17	0 / 100	2029 ms	16056 KiB

swap

#include "swap.h"
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
using namespace std;
mt19937 rnd(7069);
typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;
using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
const int dx[8] = { -1, 0, 1, 0, -1, -1, 1, 1 };
const int dy[8] = { 0, -1, 0, 1, -1, 1, -1, 1 };
const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(1000000007);
const ll MOD2 = ll(998244353);

const int N = 100005;
int used[N];
vector<pii> g[N];
int n, m;
int l, r, mid, x, y, ans;
bool f = false;

void init(int N, int M, vi U, vi V, vi W) {
    n = N, m = M;
    for (int i = 0; i < m; ++i) {
        g[U[i]].pub({ W[i], V[i] });
        g[V[i]].pub({ W[i],U[i] });
    }
    for (int i = 0; i < n; ++i) {
        sort(all(g[i]));
    }
}

void dfs(int u, bool fx = false) {
    if (u == y && fx) {
        f = true;
    }
    if (u == y) return;
    used[u] = 1;
    int dep = upper_bound(all(g[u]), mpr(mid, MAX)) - g[u].begin();
    for (auto to : g[u]) {
        if (to.ff > mid) break;
        if (used[to.ss] && to.ss == y) {
            f = true;
            continue;
        }
        if (used[to.ss]) continue;
        if (u == x) {
            dfs(to.ss, fx);
            continue;
        }
        if (dep >= 3) {
            dfs(to.ss, true);
            continue;
        }
        dfs(to.ss, fx);
    }
}

int getMinimumFuelCapacity(int X, int Y) {
    x = X, y = Y;
    l = 0, r = 1e9;
    ans = -1;
    while (l <= r) {
        mid = (l + r) / 2;
        f = false;
        for (int i = 0; i < n; ++i) {
            used[i] = 0;
        }
        dfs(x);
        if (f) {
            r = mid - 1;
            ans = mid;
        }
        else {
            l = mid + 1;
        }
    }
    return ans;
}

/*
1.
5 6
0 1 4
0 2 4
1 2 1
1 3 2
1 4 10
2 3 3
3
1 2
2 4
0 1

2.
3 2
0 1 5
0 2 5
1
1 2

answers
1.
3
10
4

2.
-1
*/

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27